JPH043459B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to shuttleless looms, more specifically, air jet looms, water jet looms, etc.
The present invention relates to a weft processing method when a machine is stopped.

[Conventional technology]

In order to speed up the weaving operation, an air jet loom or a water jet loom is used in which measured weft yarns are inserted into a shed formed between upper and lower warp yarns using a jet nozzle. In such high-speed looms, since the weaving speed is high, the impact of stopping the loom on productivity decline is more significant than in conventional looms. Therefore, it is desirable that the stoppage time in the jet room be as short as possible. On the other hand, in jet looms, unlike conventional shuttled looms, the weft threads are moved through the shed by air or fluid such as water without using a shuttle, so weft insertion errors are more likely than in shuttled looms. easy. That is, the weft yarn may not be supplied from the jet nozzle, a so-called weft supply error, or the weft yarn may be supplied from the jet nozzle but not reach the selvage yarn on the opposite side of the jet nozzle, a so-called conveyance error.

In addition, in jet looms that operate at high speeds, even if the loom is stopped immediately after a weft insertion error is discovered, the weft insertion system is installed to prevent parts of the loom from being damaged due to excessive deceleration. The timing is selected so that the machine stops after approximately one cycle of inertial operation after a mistake is detected. Therefore, conventionally, when the jet loom is stopped due to a weft insertion error signal, the next weft insertion cycle is completed before the jet loom stops. Therefore,
It is necessary to reverse the machine and remove not only the weft yarn where the weft insertion error occurred, but also the weft yarns inserted in the cycle after the weft insertion error. By the way, the weft inserted immediately after a weft insertion error is beaten like a normal weft and is firmly held in the woven fabric, so it cannot be easily removed and the removal work is extremely troublesome.

Additionally, if the warp threads (including the selvage threads) are cut during weaving work or the loom is turned off due to manual operation, the loom will run for about one cycle due to inertia for the same reason as mentioned above. Stop. If you try to remove the weft inserted during this inertial movement in order to prevent defects such as weaving steps from occurring in the woven fabric, for the same reason as mentioned above,
Its removal is not easy.

[Problem that the invention seeks to solve]

Japanese Patent Application Laid-open No. 59-21757 describes a method for removing weft yarns that have been inserted incorrectly as described above, by using a shutter installed at the outlet of the main nozzle to remove weft yarns that are inserted during inertial operation after the machine has stopped. A method in which the weft yarns are blocked and suctioned to a suction nozzle installed near the main nozzle, and a pair of take-up rollers installed near the tip of the suction nozzle picks up the missed weft yarn and actively sends it to the suction nozzle for removal. is disclosed.

In this method, before restarting the loom,
It is necessary to cut the weft yarn connected between the main nozzle and the suction nozzle automatically or manually. However, with this method, when attempting to automatically cut the weft yarn, since the end of the weft yarn in the suction nozzle is a free end, sufficient tension is not applied to the weft yarn when cutting the weft yarn, resulting in cutting. The problem is that it is easy to make mistakes.

An object of the present invention is to provide a method that can reliably dispose of weft yarns to be removed when the jet loom is stopped as described above.

[Means for solving problems]

The present invention prevents weft insertion of a weft following a missed weft by a stop signal of a loom, and also sets a weft cutting cutter in an inoperable state to connect the missed weft from a main nozzle, so that the weft that has been prevented from being inserted is pulled out from the main nozzle and introduced into a guide pipe installed near the main nozzle, and the weft introduced into the guide pipe is guided to a suction pipe, and is held in a substantially straight state by the guide pipe and suction pipe. A pair of take-up rollers disposed between both pipes hold and pull the weft thread between the main nozzle and the guide pipe, and the weft thread connected to the guide pipe is pulled by the rollers. The above-mentioned object is achieved by the weft treatment method in the jet room which is discharged by the suction pipe.

[Effect]

In the present invention, a stop signal of the loom is used to prevent weft insertion of a weft following a missed weft, and the weft cutting cutter is rendered inactive, allowing the missed weft to be connected from the main nozzle.

The weft threads that have prevented weft insertion are ejected from the main nozzle during inertial operation of the machine or after the machine has stopped.
For example, as disclosed in Japanese Unexamined Patent Publication No. 59-21752, it can be received on a shutter and then sucked into a suction pipe.

In the present invention, a guide pipe and a pair of take-up rollers are provided between the main nozzle and the suction pipe, and the weft that has been prevented from being inserted is pulled out from the main nozzle, and the guide pipe installed near the main nozzle to be introduced.

The weft yarn introduced into the guide pipe is guided to the suction pipe, the weft yarn is held in an almost straight state by the guide pipe and the suction pipe, and the weft yarn is pinched and pulled by a pair of take-up rollers arranged between both pipes. do. In this state, the weft between the main nozzle and the guide pipe is cut.

The cut weft yarn connected to the guide pipe is pulled by a take-up roller and discharged by a suction pipe.

〔Example〕

The present invention will be described in detail below with reference to the accompanying drawings. The drive system of the air jet room according to the present invention has the same structure as the conventional device.

When carrying out the present invention, as a weft storage device, a length measurement storage mechanism that combines a feed roller and a pool pipe disclosed in Japanese Patent Application Laid-open No. 59-21752, or a length measurement storage mechanism that combines a feed roller and a pool pipe disclosed in Japanese Patent Application Laid-Open No. 57-16946, for example, may be used. and Japanese Patent Publication No. 1983
A length measuring storage mechanism disclosed in Japanese Patent No. 58028, in which a weft is wound around the circumferential surface of a length measuring drum and the unwinding from the length measuring drum is controlled, can be used.

A gripper (not shown) is provided between the weft storage device (not shown) and the main air jet nozzle 2 to control the supply of weft from the weft storage device to the main air jet nozzle 2. The main air jet nozzle 2 injects compressed air in synchronization with the rotation of a crankshaft (not shown), inserts the weft yarn into the shed formed between the upper and lower warp yarns 18,
Then, use the reed 1 to beat the reed.

A detector 14 of an appropriate type such as a photoelectric type, mechanical type, or fluid type is provided near the selvage yarn on the opposite side of the main air jet nozzle 2 to detect whether the weft yarn has been inserted reliably. For example,
It is detected that the weft yarn is being reliably supplied from the main air jet nozzle 2 according to the method described in Japanese Patent No. 21475.

As shown in the drawing, a guide pipe 7 is installed near the main air jet nozzle 2. One end of the guide pipe 7 opens between the main air jet nozzle 2 and the selvage thread. The other end of the guide pipe 7 is placed opposite the suction pipe 10.

In the illustrated embodiment, a suction nozzle 19 of the known ejector type is provided in the middle of the guide pipe 7, which generates a suction force by the action of compressed air.

A pair of take-off rollers 8, 8' are provided between the guide pipe 7 and the suction pipe 10. The roller 8' is driven and rotated at a fixed position, and the roller 8 is a pressure roller made of a rubber roller, and can be moved forward and backward with respect to the driving roller 8' by an air cylinder 9.

A shutter 17 is located near the tip of the guide pipe 7 and is rotatable between a position away from the weft path and a position intersecting the weft path. In addition, shutter 1
7 is not limited to one that rotates in the vertical direction, but may also move in the front-back direction of the loom, for example. Further, a cutter 16 is provided at the tip of the guide pipe 7.

An electromagnetic solenoid or air cylinder (not shown) is installed between the main air jet nozzle 2 and the gripper.
An auxiliary gripper (not shown) is provided which is opened and closed by means of, for example, an auxiliary gripper.

A weft cutting cutter is provided on the machine base.
In this weft cutting cutter, a cam 5 for operating the upper blade of the cutter is fixed to a shaft that rotates in conjunction with a crankshaft. The cam 5 swings the lever to rotate the movable lower blade 3. The fixed blade 4 is loosely fitted onto the support shaft 20 of the movable blade 3, and is fixed by electromagnetic solenoids 6, 6'. Thus, during steady operation, the fixed blade 4 and the movable blade 3 cut the weft yarn. On the other hand, when the stop signal is sent, the weft is not cut between the movable blade 3 and the fixed blade 4 due to the action of the electromagnetic solenoids 6 and 6'.

Next, the configuration of the extrusion member will be explained. The beam member 21, which is longer than the weaving width of the loom, is supported at both ends by a pair of vertical rods, and is installed above or below the woven fabric of the loom. The beam member 21 has one arm member 22 at the center of the weave width, or a plurality of arm members 22 spaced apart in the weave width direction, depending on the weave width, weave structure, yarn material, and the movement stroke of the arm member in the front and back direction. The push-out member 11 is attached to the swing lever 12 which is fixed to the swing lever 12 and rotatably supported at the tip of the arm member 22. The swing lever 12 is connected to a motor 23 via gears 13 and 13', and the push-out member 11 is rotated together with the swing lever 12 by the motor 23.

Next, an embodiment of the weft processing method at the time of abnormal stop of this embodiment will be described. The heald frame (not shown) is moved to open, and the weft threads are inserted into the shed formed between the upper and lower warp threads 18. That is, the weft yarn unwound from the cheese is stored in the weft storage device according to the rotation of the crankshaft. The gripper provided between the weft storage device and the main air jet nozzle 2 and the main air jet nozzle 2 are operated and controlled in synchronization with the rotation of the crankshaft, and compressed air is injected from the main air jet nozzle 2. According to
The weft stored in the weft storage device is inserted into a shed formed between the upper and lower warps 18.

A detector 14 installed near the selvedge yarn on the opposite side of the main jet nozzle 2 checks the weft insertion state when the warp yarns 18 are almost closed (crank angle 250 to 300 degrees), and detects if the weft is in the shed due to some reason. If a weft insertion error occurs in which the inserted weft yarn does not reach the selvage yarn on the opposite side of the main air jet nozzle 2, the detector 14 issues a weft insertion error signal. In response to this weft insertion error signal, the operation of the motor that drives the machine is stopped and the machine enters inertial operation.

Further, when a weft insertion error signal is transmitted, the weft yarn is gripped upstream of the main air jet nozzle 2 and the supply of the weft yarn to the main air jet nozzle 2 is stopped. In addition, as a method of stopping the supply of weft yarn to the main air jet nozzle, for example,
As described in Japanese Patent No. 58-197340, the weft length measuring device may be inactive, or the weft thread may be gripped by a gripper installed between the weft length measuring device and the main air jet nozzle, and An auxiliary gripper for gripping the weft may be installed separately from the gripper.

In addition, the cutting function of the weft cutting cutter is temporarily disabled so that the weft that has been inserted incorrectly is connected to the jet nozzle. That is, by the action of the electromagnetic solenoids 6 and 6', the movable blade 3 and the fixed blade 4
Make sure that the weft threads are not cut in between.

Therefore, weft insertion after the weft insertion error signal is sent is prevented, and the weft yarn is connected to the main air jet nozzle 2 from the shed.

After the machine, which was operating inertia, moves for about one cycle, it stops with the warp threads 18 almost closed (crank angle of about 300 degrees).

In this embodiment, after the machine has stopped, the shutter 1
7 intersects the weft path, and the weft that has been blocked from being inserted is injected from the main air jet nozzle 2 to the shutter 17. In this way, the weft yarn after a weft insertion error is guided to the shutter 17, and further suctioned by the suction nozzle 19 to the guide pipe 7.
2, and is sucked into a suction pipe 10 disposed opposite the other end of the guide pipe 7. Next, the rollers 8 move forward to pinch and pull the weft, which is held in a substantially straight state by the air flow between the guide pipe 7 and the suction pipe 10, between the drive roller 8' and the drive roller 8'. At the same time, cutter 1 cuts the weft thread between main air jet nozzle 2 and guide pipe 7.
Cut by 6.

Next, prepare for a reversal. That is, the main air jet nozzle 2 is rendered inoperative. Close the gripper or close the auxiliary gripper with an electromagnetic solenoid. Furthermore, the weft supply mechanism is made inactive. On the other hand, the shutter 17 at the tip of the guide pipe 7 is removed from the weft path. In this state, the drive motor can be reversed directly or an auxiliary motor (not shown) provided separately from the drive motor can be operated to rotate the machine approximately 480 degrees.
By reversing the warp threads 18, the warp threads 18 are brought into an open state (crank angle approximately 180 degrees).

In this open state, by inserting the extrusion member 11 into the space between the weft and the woven fabric in response to an extrusion start signal, the machine automatically pulls the weft that has been erroneously inserted from the woven fabric. The extrusion start signal may be sent by a timer when a predetermined time elapses after a stop signal such as the above-mentioned weft insertion error signal is sent, and when the machine is reversed and the machine is in the open state, a signal from a limit switch or the like may be sent. Alternatively, the call may be made manually by pressing a button.

During steady operation, the tip of the extrusion member 11 is moved away from the woven fabric by the motor 23, and the extrusion member 11 does not interfere with the weaving work of the jet loom during steady operation.

In response to the above-mentioned stop signal, the loom is stopped, the upper and lower warps 18 are stopped in an open state, and when the extrusion start signal is sent, the swing arm 1 is moved by the motor 23.
2 is rotated, the tip of the extrusion member 11 comes into contact with the woven fabric, and furthermore, the tip of the extrusion member 11 slides on the woven fabric with an appropriate pressing force.

The tip of the extrusion member 11 reaches the space between the woven fabric and the weft 15 inserted into the final weft, enters the tip of the extrusion member 11 into the space, and the extrusion member 11 pulls the weft 15 away from the fabric.

The weft yarn 15 that has been separated in this way is no longer held tightly by the warp yarns, and moreover, this missed weft yarn 15 passes through the guide pipe 7 and into the suction pipe 10.
Since it is connected to a pair of take-up rollers 8,
8' and suction pipe 10, it can be easily pulled out and removed.

After removing the missed weft in this way, the weft can be switched on automatically or manually.
Warp thread 18 closed (crank angle approximately 270 degrees)
Rotate the machine approximately 270 degrees until it is suitable for starting the air jet room.

Next, the main air jet nozzle 2 is put into operation. The electromagnetic solenoid is de-energized to open the auxiliary gripper, while the gripper is also in steady operation. Furthermore, the weft supply mechanism is put into operation. In this state, restart the air jet room operation.

In the above-mentioned embodiment, even if the weaving front position changes slightly back and forth depending on the weaving structure, or even if the weaving front position changes slightly in the weaving width direction of the same woven fabric, the woven fabric and the final weft insertion weft In order to reliably insert the tip of the extrusion member 11 into the intervening booth and reliably extrude the final weft inserted weft, the tip of the extrusion member 11 is slid over a considerable distance along the woven fabric. I'm letting you do it. However, when the above-mentioned fluctuations are small, the tip of the extrusion member 11 may aim at and enter the booth between the woven fabric and the weft.

Furthermore, in the embodiment described above, the weft yarn blown out from the main air jet nozzle 2 is guided to the guide pipe 7 by the shutter 17.
It is also possible to use an air blow instead of 7, or to use only the suction nozzle 19 for suction without using a guide means such as a shutter.

In the above explanation, an example of repairing a weft thread that has been inserted incorrectly has been explained, but the present invention can
It can also be applied when the air jet room stops due to a selvage breakage or human operation.

Note that the suction nozzle 19 described above generates suction force by the ejector action of compressed air. However, the suction nozzle is not limited to one based on ejector action, and for example, a suction nozzle connected to a suction source to generate suction force may be employed.

〔Effect of the invention〕

According to the present invention, the weft to be removed can be held in a substantially straight state by the guide pipe and the suction pipe, and the weft can be reliably gripped by the pair of take-up rollers disposed between the two pipes.

Since the weft between the main air jet nozzle and the guide pipe is cut while the weft is pulled by the take-up roller and sufficient tension is applied, the weft can be cut reliably without cutting errors.

Further, according to the present invention, the cut weft yarn is sucked by the suction pipe and pulled by the take-up roller, so that it can be reliably discharged from the suction pipe, increasing the reliability of the weft yarn processing operation.

According to the present invention, weft yarn removal in the jet room can be carried out reliably and it is possible to completely or almost completely automate the weft yarn removal.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of an air jet room according to the present invention. 1... Reed, 2... Main air jet nozzle,
7... Guide pipe, 10... Suction pipe, 14...
...Detector, 11...Extrusion member, 22...Arm member, 19...Suction nozzle.

Claims (1)

[Scope of Claims] 1. The weft insertion of the weft following the missed weft is prevented by a stop signal of the loom, and the weft cutting cutter is put in an inoperative state to connect the missed weft from the main nozzle, thereby preventing the weft insertion. The weft yarn is pulled out from the main nozzle and introduced into a guide pipe installed near the main nozzle, and the weft yarn introduced into the guide pipe is guided to a suction pipe, and the weft yarn is kept in an almost straight state by the guide pipe and suction pipe. The held weft is pinched and pulled by a pair of take-up rollers arranged between both pipes, and the weft between the main nozzle and the guide pipe is cut, and the weft connected to the guide pipe is pulled by the rollers. A method for processing weft yarns in a jet room, characterized in that the weft yarns are pulled and discharged by the suction pipe. 2. Stopping the jet loom in an open state to free the weft inserted just before the jet loom stops, and automatically inserting a pushing member between the weft and the woven fabric to pull the weft from the woven fabric. A weft processing method in a jet room according to claim 1, wherein the separated weft is suctioned and removed by a suction pipe.